126 lines
3.2 KiB
C++
126 lines
3.2 KiB
C++
// Copyright 2009-2021 Intel Corporation
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include "default.h"
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namespace embree
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{
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/*! An item on the stack holds the node ID and distance of that node. */
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template<typename T>
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struct __aligned(16) StackItemT
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{
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/*! assert that the xchg function works */
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static_assert(sizeof(T) <= 12, "sizeof(T) <= 12 failed");
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__forceinline StackItemT() {}
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__forceinline StackItemT(T &ptr, unsigned &dist) : ptr(ptr), dist(dist) {}
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/*! use SSE instructions to swap stack items */
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__forceinline static void xchg(StackItemT& a, StackItemT& b)
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{
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const vfloat4 sse_a = vfloat4::load((float*)&a);
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const vfloat4 sse_b = vfloat4::load((float*)&b);
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vfloat4::store(&a,sse_b);
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vfloat4::store(&b,sse_a);
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}
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/*! Sort 2 stack items. */
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__forceinline friend void sort(StackItemT& s1, StackItemT& s2) {
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if (s2.dist < s1.dist) xchg(s2,s1);
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}
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/*! Sort 3 stack items. */
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__forceinline friend void sort(StackItemT& s1, StackItemT& s2, StackItemT& s3)
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{
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if (s2.dist < s1.dist) xchg(s2,s1);
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if (s3.dist < s2.dist) xchg(s3,s2);
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if (s2.dist < s1.dist) xchg(s2,s1);
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}
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/*! Sort 4 stack items. */
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__forceinline friend void sort(StackItemT& s1, StackItemT& s2, StackItemT& s3, StackItemT& s4)
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{
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if (s2.dist < s1.dist) xchg(s2,s1);
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if (s4.dist < s3.dist) xchg(s4,s3);
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if (s3.dist < s1.dist) xchg(s3,s1);
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if (s4.dist < s2.dist) xchg(s4,s2);
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if (s3.dist < s2.dist) xchg(s3,s2);
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}
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/*! use SSE instructions to swap stack items */
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__forceinline static void cmp_xchg(vint4& a, vint4& b)
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{
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#if defined(__AVX512VL__)
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const vboolf4 mask(shuffle<2,2,2,2>(b) < shuffle<2,2,2,2>(a));
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#else
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const vboolf4 mask0(b < a);
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const vboolf4 mask(shuffle<2,2,2,2>(mask0));
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#endif
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const vint4 c = select(mask,b,a);
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const vint4 d = select(mask,a,b);
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a = c;
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b = d;
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}
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/*! Sort 3 stack items. */
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__forceinline static void sort3(vint4& s1, vint4& s2, vint4& s3)
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{
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cmp_xchg(s2,s1);
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cmp_xchg(s3,s2);
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cmp_xchg(s2,s1);
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}
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/*! Sort 4 stack items. */
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__forceinline static void sort4(vint4& s1, vint4& s2, vint4& s3, vint4& s4)
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{
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cmp_xchg(s2,s1);
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cmp_xchg(s4,s3);
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cmp_xchg(s3,s1);
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cmp_xchg(s4,s2);
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cmp_xchg(s3,s2);
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}
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/*! Sort N stack items. */
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__forceinline friend void sort(StackItemT* begin, StackItemT* end)
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{
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for (StackItemT* i = begin+1; i != end; ++i)
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{
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const vfloat4 item = vfloat4::load((float*)i);
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const unsigned dist = i->dist;
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StackItemT* j = i;
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while ((j != begin) && ((j-1)->dist < dist))
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{
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vfloat4::store(j, vfloat4::load((float*)(j-1)));
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--j;
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}
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vfloat4::store(j, item);
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}
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}
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public:
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T ptr;
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unsigned dist;
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};
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/*! An item on the stack holds the node ID and active ray mask. */
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template<typename T>
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struct __aligned(8) StackItemMaskT
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{
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T ptr;
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size_t mask;
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};
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struct __aligned(8) StackItemMaskCoherent
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{
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size_t mask;
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size_t parent;
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size_t child;
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};
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}
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